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There are several places where a gesture might get dropped/filtered in
the input router. The lack of tracing here makes it difficult to debug
"scrolling doesn't work" issues.

Bug: 1048098
Change-Id: I5917d3ceb5cd1b74f7c4ae3097dcb8e2ec009ade
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2106968
Auto-Submit: David Bokan <bokan@chromium.org>
Reviewed-by: Nick Burris <nburris@chromium.org>
Commit-Queue: Nick Burris <nburris@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751383}